International Journal of Thermophysics最新文献

{"title":"Magnetic Amplification of Heat Transfer Requires Customized Ferronanofluids","authors":"A. Meyer,&nbsp;A. Potthoff,&nbsp;C. Hanzelmann,&nbsp;S. Feja,&nbsp;M. H. Buschmann","doi":"10.1007/s10765-025-03571-z","DOIUrl":"10.1007/s10765-025-03571-z","url":null,"abstract":"<div><p>New heat transfer technologies are needed to reduce the net greenhouse gas emissions resulting from industrial applications. One such technology could be the use of ferronanofluids under the influence of magnetic forces to improve convective heat transfer. Our study presents an innovative approach for the production routing of the suspensions required for this purpose. The central idea is to start from a profile of requirements, which specifies the characteristics of the needed suspension with respect to the physical characteristics of convective heat transfer. The obtained ferronanofluid is experimentally characterized in detail with respect to its chemophysical and thermophysical properties. Its Newtonian behavior and the experimentally determined Prandtl number, which matches the values for water, make it a promising candidate for benchmark experiments on convective heat transfer.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergizing Water Desalination of A Conical Solar Distiller Using Copper Fins Filled with Phosphate As A Porous Sensible Heat Storage Material","authors":"Mahmoud Bady,&nbsp;Mohammed El Hadi Attia,&nbsp;Abd Elnaby Kabeel,&nbsp;Nabil A. S. Elminshawy,&nbsp;Ravishankar Sathyamurthy","doi":"10.1007/s10765-025-03586-6","DOIUrl":"10.1007/s10765-025-03586-6","url":null,"abstract":"<div><p>The increasing global demand for freshwater necessitates innovative and sustainable water desalination techniques. This study presents a novel approach to enhance the performance of conical solar distillers by integrating phosphate-filled copper fins as a porous sensible heat storage material. Three configurations were tested: a traditional conical solar still (TCSS), one with copper conical fins (CSS-CCF), and one with phosphate-filled copper conical fins (CSS-CCF&amp;P), each evaluated at fin spacings of 0 cm, 1 cm, and 2 cm. The CSS-CCF&amp;P configuration at 0 cm spacing achieved a maximum daily water yield of 8.2 L·m⁻², compared to 4.8 L·m⁻² for the TCSS, a 69.8 % improvement. Thermal efficiency reached 84.6 % for CSS-CCF&amp;P0 versus 54.7 % for the TCSS. Furthermore, annual CO₂ mitigation was 3.5 tons for CSS-CCF&amp;P0, significantly exceeding the 2.1 tons achieved by the unmodified system. The key novelty lies in the synergistic use of copper fins and phosphate material, which combines high thermal conductivity with enhanced heat storage to maintain evaporation during low solar intensity periods. These findings highlight the system's potential for efficient and eco-friendly freshwater production, particularly in arid and resource-constrained regions.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Updated Prediction Model for Thermal Conductivity of Soil Considering Liquid Phase Division","authors":"Shaohu Zhan,&nbsp;Haohua Wang,&nbsp;Zi Ying,&nbsp;Yurong Lv,&nbsp;Yaxiong Liao,&nbsp;Yonggui Chen,&nbsp;Yongfeng Deng,&nbsp;Weimin Ye","doi":"10.1007/s10765-025-03588-4","DOIUrl":"10.1007/s10765-025-03588-4","url":null,"abstract":"<div><p>The safety of geo-based infrastructures depends on the performance evolution of geomaterials in a cyclic temperature environment, where the thermal conductivity is a key factor. The thermal conductivity of soil, which is typically predicted using the Johansen model, varies widely because of the different thermal conductivities of solid minerals when neglecting the complex hydration of clay minerals. In this study, the water within the soil was divided into clay mineral-related bound water and gravity-related free water. Hence, considering the microstructure of saturated deposited and stabilized soils, two phases were identified. One phase consisted of solid mineral and bound water and the other was free water. The bound water content and thermal conductivity were determined using the thermogravimetric and thermal probe methods, respectively, and an updated liquid-phase division (i.e., LD) model was proposed based on the Johansen model. A comparison of the predicted and measured values showed that the precisions of the traditional Johansen and updated LD model were ± 15 % and ± 5 %, respectively. This study not only clarified the importance of soil thermal conductivity but also provided an understanding of the performance evolution of geomaterials under long-term service conditions.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intrinsic Thermal Conductivity of Mg(_{2})NiH(_{4}) at High Pressures: A First-Principles Study","authors":"Takuma Shiga,&nbsp;Takashi Yagi,&nbsp;Hiroshi Fujihisa","doi":"10.1007/s10765-025-03587-5","DOIUrl":"10.1007/s10765-025-03587-5","url":null,"abstract":"<div><p>To realize a hydrogen energy-based society, an efficient solid-state hydrogen-storage material is crucial. Among candidate materials, the storage performance and thermal management during the hydrogenation–dehydrogenation processes need to be improved by optimizing the thermofluid dynamics and thermal conductivity. A common approach is to add a thermally conductive material; however, few studies have tried to enhance the intrinsic thermal conductivity of solid-state hydrogen-storage materials because of their many crystalline phases depending on the temperature, pressure, and hydrogen concentration. We employed a first-principles anharmonic lattice dynamics to calculate the lattice thermal conductivity of the solid-state hydrogen-storage material Mg<span>(_{2})</span>NiH<span>(_{4})</span> considering various structures that correspond to the unresolved crystalline phases observed in previous high-pressure experiments. Our results revealed that the thermal conductivity of Mg<span>(_{2})</span>NiH<span>(_{4})</span> has a non-trivial dependence on pressure that is driven by complex modulations of the vibrational characteristics. Moreover, the room-temperature thermal conductivities of the crystalline phases are below 20 W m<span>(^{-1})</span> K<span>(^{-1})</span> at pressures below 10 GPa, which was attributed to the large mass contrast of constituent elements and the structural complexity. These findings provide valuable insights for the thermal engineering of hydrogen-storage units based on Mg<span>(_{2})</span>NiH<span>(_{4})</span>.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermophysical Properties of Propaline + 1-Alcohols: An Experimental and Molecular Insight","authors":"Guadalupe Pérez-Durán,&nbsp;Noor Alomari,&nbsp;Mariana Ramos-Estrada,&nbsp;Mert Atilhan,&nbsp;Gustavo A. Iglesias-Silva","doi":"10.1007/s10765-025-03581-x","DOIUrl":"10.1007/s10765-025-03581-x","url":null,"abstract":"<div><p>In this work, we measure density, speed of sound, and viscosities of Propaline [Choline Chloride:Propylene Glycol (1:2)] with methanol, ethanol, and 1-propanol at temperatures from (288.15 to 343.15) K at atmospheric pressure. A. vibrating tube densimeter and a microviscometer are used to obtain these physical properties. Propaline crystallizes at low temperatures. Derived properties (excess molar volumes, viscosity deviations, speed of sound deviations, and isentropic compressibility deviations) are obtained from experimental measurements. The derived properties are negative at all temperatures except for speed of sound deviations which are negative and positive. Derived properties are represented with the Redlich–Kister equation. Kinematic viscosities are correlated with the McAllister and the Nava-Rios equations. The average absolute relative deviation is (2.01 and 1.47)% for the McAllister and Nava-Rios equations, respectively. Density Functional Theory (DFT) simulations reveal weak hydrogen bonding interactions between Propaline components and ethanol molecules, characterized by electron density (ρ) and Laplacian values (∇²ρ) near the lower bound of hydrogen bonding criteria. Molecular dynamics (MD) simulations demonstrate the reinforcement of intermediate-range molecular ordering at lower ethanol concentrations, which gradually transitions into disorder at higher ethanol concentrations due to thermal disruption of the hydrogen bond network.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of Coefficient of Thermal Expansion of Metallic Materials from 20 to 150 K by Speckle Interferometry","authors":"YouWei Yang,&nbsp;YiMeng Zhu,&nbsp;CuiPing Yu,&nbsp;JiaMeng Song,&nbsp;ZhiBin Li,&nbsp;QingHui Pan,&nbsp;Yong Shuai","doi":"10.1007/s10765-025-03591-9","DOIUrl":"10.1007/s10765-025-03591-9","url":null,"abstract":"<div><p>The coefficient of thermal expansion (CTE) is a critical physical property of materials, especially in deep-space exploration, where precise determination of material properties is decisive for the performance and reliability of spacecraft, while traditional CTE measurement instruments face significant challenges in achieving CTE measurements below liquid nitrogen temperatures (&lt; 77 K). This study developed a testing system for measuring the CTE of highly thermally conductive materials within the temperature range of 20 K to 150 K using the classical principle of speckle interferometry. The materials were cooled to cryogenic temperatures using a cryostat, and measurements were taken during the warming process as they returned to room temperature. This method completely eliminates the vibrations generated during the operation of cryostat, making it possible to acquire speckle images of the sample at low temperatures. Since the ESPI method directly measures the strain on the sample surface, it eliminates the need for instrument thermal expansion calibration using a reference sample. Detailed measurements were conducted on the two materials: brass and copper. To validate the accuracy and reliability of the developed system, comparative analysis was conducted between the CTE obtained in this study and those reported in other literature, as well as with the measurements from a commercial instrument within the overlapping temperature range. The results reveal that the maximum error of CTE for the above materials using the proposed setup is 2.68% and 4.40%, respectively, indicating good accuracy for engineering applications. Furthermore, the functionality of the proposed setup for measuring the ultra-low temperature CTE of thin-film materials was also validated.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review of Thermal Gap Conductance Models and Measurement Approaches Toward an Understanding Beyond UO2 and Zirconium-Alloy Interfaces","authors":"Matthew Goodson,&nbsp;Gregory Noble,&nbsp;Lan Li,&nbsp;Lu Cai,&nbsp;Tsvetoslav Pavlov,&nbsp;Troy Munro","doi":"10.1007/s10765-025-03582-w","DOIUrl":"10.1007/s10765-025-03582-w","url":null,"abstract":"<div><p>Heat transfer within a nuclear reactor is impacted by both the thermal properties of the individual materials (fuel, cladding) and the thermal conductance of the gap between the fuel and cladding. This gap distance changes over the lifetime of the fuel, and the associated variation in thermal conductance is important to the modeling and safe operation of nuclear reactors. This review article is intended to add to existing work by specifically discussing both modeling and experimental methodologies to determine the thermal gap conductance between two solid materials separated by gas as the structures of the materials change. The purpose of the review is to understand the limitations and benefits of each approach, both modeling and experimental, and to provide recommendations for future research directions for the nuclear materials community in developing an understanding of the heat transfer through gas gaps for accident tolerant fuels (ATF). The key takeaway from a review of the relevant models is that the ability to determine the thermal accommodation coefficient (TAC) by simulations aids in reducing uncertainty in experimental results. Coupling the TAC-determining simulations with multi-scale modeling approaches are necessary to understand many complex mechanisms affecting thermal gap conductance. The recommended experimental approach is either laser flash analysis or lock-in IR thermography because they are transient approaches that allow for more rapid measurements (compared to steady-state approaches) and are able to detect the range of expected thermal gap conductances (typically on the order of 1 × 10⁴ W·m⁻²·K⁻¹). Future research efforts focused on nanoscale modeling of the thermal accommodation coefficient coupled to engineering scale models would benefit the community. These models can then be verified by experiment measurements using the laser flash analysis or lock-IR thermography techniques.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Equation of State and Phase Diagram for Zirconium","authors":"Nikolay V. Kozyrev","doi":"10.1007/s10765-025-03583-9","DOIUrl":"10.1007/s10765-025-03583-9","url":null,"abstract":"<div><p>Equations of state for solid (α-, β-, and ω-phases) and liquid zirconium (Zr) have been established by simultaneously co-optimizing the thermodynamic properties, compressibility, thermal expansion, and bulk compression moduli using the phase diagram data. The totality of experimental data was optimized using the temperature-dependent Tait equation over a pressure range up to 1300 kbar and a temperature range from 20 K to 3800 K. The use of the existing phase diagram data in the optimization process made it possible to determine the missing parameters of the equations of state for all Zr phases and refine the position of the phase lines. The calculated triple point of α–ω–β is located at 975.2 K and 67.09 kbar, which is in good agreement with the experimental data. The derived equations of state (EoSs) reproduce the entire set of the existing experimental data within the measurement error.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Equation of State of Rhenium Under High Temperatures and Pressures Predicted by Ensemble Theory","authors":"Yue-Yue Tian,&nbsp;Hui-fen Zhang,&nbsp;Bo-Yuan Ning,&nbsp;Xi-Jing Ning","doi":"10.1007/s10765-025-03584-8","DOIUrl":"10.1007/s10765-025-03584-8","url":null,"abstract":"<div><p>The high-temperature and high-pressure equations of states (EOSs) of rhenium up to 3000 K and 900 GPa are predicted by a recently developed method in the framework of statistical ensemble theory with <i>ab initio</i> computational precision. The predicted isothermal EOSs are generally consistent with semi-empirical calculations below 150 GPa and 3000 K. Specifically, the predicted isobaric EOS at one atmosphere is in good agreement with previous experiments. Moreover, the bulk modulus obtained in this work is closer to the experimental measurements than other theoretical works. Based on our calculations, the disputes between previous experiments are analyzed, and it is expected that the EOSs predicted under extreme conditions may be verified in future experiments.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Freeze Casting of Porous Copper with Lamellar Morphology from Cupric Oxide Suspensions for Enhancing Through-Plane Thermal Conductivity","authors":"Joseph Sheppard,&nbsp;Ruey-Hung Chen,&nbsp;Yucheng Lan,&nbsp;Ronghui Ma","doi":"10.1007/s10765-025-03578-6","DOIUrl":"10.1007/s10765-025-03578-6","url":null,"abstract":"<div><p>This study reports porous copper with lamellar morphology produced with the freeze casting method, in which aqueous suspensions of cupric oxide particles (1 µm–2 µm) were frozen under controlled cooling rates, followed by ice sublimation, reduction to copper, and sintering. The effects of the cooling rate (0.008–0.08 °C·s⁻¹), the particle loading (6.0 vol %–13.0 vol %), and the concentration of polyvinyl alcohol (PVA) (1.2 wt %–3.6 wt %) on the through-plane effective thermal conductivity and structural characteristics of the as-produced material were investigated. Over a narrow range of cooling rates (0.016–0.026 °C·s⁻¹), continuous lamellae formed, and the porous copper structures with 6.0 vol %–13.0 vol % particle loadings demonstrated an average porosity of 66.7–89.5 %, an average through-plane effective thermal conductivity of 9.5 <span>(hbox {W m}^{-1}cdot {K}^{-1})</span>–12.9 <span>(hbox {W m}^{-1}cdot {K}^{-1})</span>, and average lamellar thickness and spacings less than 50 <span>(upmu{m})</span>. The highest through-plane effective thermal conductivity of 16.7 Wm^-1·K^-1 was obtained at 65.7 % porosity with suspensions of 13.0 vol % particle loading. These results suggest that freeze-cast porous copper has a higher through-plane effective thermal conductivity than commercial copper foams for a given porosity. The fastest cooling rate (0.08 °C·s⁻¹) resulted in engulfment of particle aggregates by the freezing front. The effective thermal conductivity along the freezing direction is not uniform, showing a less than 10.0 % difference in the samples produced with the cooling rate of 0.016 °C·s⁻¹. Increasing the PVA concentration from 1.2 wt % to 3.6 wt % showed an insignificant influence on the non-uniformity of this property, but decreased its value due to the enlarged tilt angles.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"46 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}